9.3.2. Voltage and Current Calculations

Try these first

1. 1.

   What are the two main types of bipolar junction transistors?

   Hint

   Think about the arrangement of the layers.

2. 2.

   What does forward bias mean?

   Hint

   Consider the direction of current flow.

3. 3.

   What type of biasing is required for the base-emitter junction of a p-n-p transistor?

   • Forward Bias
   • Reverse Bias
   • No Bias

   Hint

   Think about which direction the current needs to flow.

4. 4.

   In an n-p-n transistor, if I_B = 10µA and I_C is expected to be 1mA, what can you deduce about β?

   Hint

   Use the relationship between collector current and base current.

5. 5.

   A p-n-p transistor is used where V_EB = 0.8V and V_EC = 3V. Calculate what will happen if V_EC continues to increase. Consider the possible effects on current.

   Hint

   Think about the implications of V_EC in controlling I_C.

6. 6.

   Design a circuit using a bipolar junction transistor to act as a switch. Specify the biasing conditions needed for proper operation.

   Hint

   Recall the biasing requirements for active region operation.